

#include "SysCrc.h"

const uint16_t ccitt_table[256] = 
{	0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280,
	0xC241, 0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481,
	0x0440, 0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81,
	0x0E40, 0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880,
	0xC841, 0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81,
	0x1A40, 0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80,
	0xDC41, 0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680,
	0xD641, 0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081,
	0x1040, 0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281,
	0x3240, 0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480,
	0xF441, 0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80,
	0xFE41, 0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881,
	0x3840, 0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80,
	0xEA41, 0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81,
	0x2C40, 0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681,
	0x2640, 0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080,
	0xE041, 0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281,
	0x6240, 0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480,
	0xA441, 0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80,
	0xAE41, 0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881,
	0x6840, 0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80,
	0xBA41, 0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81,
	0x7C40, 0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681,
	0x7640, 0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080,
	0xB041, 0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280,
	0x9241, 0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481,
	0x5440, 0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81,
	0x5E40, 0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880,
	0x9841, 0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81,
	0x4A40, 0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80,
	0x8C41, 0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680,
	0x8641, 0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081,
	0x4040,
};
/*END CRC DATA*/



/* USER CODE END Variables */

/*******************************************************************************************************/

/* USER CODE BEGIN  Function prototypes */


/****************************************************************************************
*
*函 数: Hj212CrcCheck
*
*描 述: CRC16 循环冗余校验算法。
*参 数 一: *puchMsg：需要校验的字符串指针
*参 数 二: usDataLen：要校验的字符串长度
*
*返 回 值: 返回 CRC16 校验码
*
****************************************************************************************/
uint16_t Hj212CrcCheck(uint8_t *puchMsg, uint16_t usDataLen )
{
	uint16_t i,j,crc_reg,check;
	crc_reg = 0xFFFF;
	for(i=0;i<usDataLen;i++)
	{
		crc_reg = (crc_reg>>8) ^ puchMsg[i];
		for(j=0;j<8;j++)
		{
			check = crc_reg & 0x0001;
			crc_reg >>= 1;
			if(check==0x0001)
			{
				crc_reg ^= 0xA001;
			}
		}
	}
	return crc_reg;
}

/****************************************************************************************
*
*函 数: 			ModbusCrcCheck
*
*描 述: 			CRC16 循环冗余校验算法。
*参 数 一: 		*puchMsg：需要校验的字符串指针
*参 数 二: 		usDataLen：要校验的字符串长度
*
*返 回 值: 返回 CRC16 校验码
*
****************************************************************************************/

uint16_t ModbusCrcCheck(uint8_t *puchMsg, uint16_t usDataLen)
{
	uint16_t crc = 0xffff;
	
	while (usDataLen-- > 0)
		crc = ccitt_table[(crc ^ *puchMsg++) & 0xff] ^ (crc >> 8);
	return crc;
}

/****************************************************************************************
*
*函 数: 			Chack_Xor
*
*描 述: 			xor 校验算法。
*参 数 一: 		*puchMsg：需要校验的字符串指针
*参 数 二: 		usDataLen：要校验的字符串长度
*
*返 回 值: 返回 CRC16 校验码
*
****************************************************************************************/

uint8_t Chack_Xor(uint8_t *puchMsg,uint16_t usDataLen)
{
	uint8_t	stmp=0;
	uint16_t	crc_i;
	for(crc_i = 0; crc_i < usDataLen; crc_i++)
	{
		stmp=stmp^puchMsg[crc_i];
	}
	return stmp;
}
